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header swap 5.7

  1. 2019 5.7 exhaust size for 6.4 header swap

    Intake & Exhaust
    I have 6,4 headers off a 2018 scat, i did a post before and am confused on the different sizes of the exhaust system on my 2019 Challenger RT. the headers are 3inch and i know that i need 3inch midpipes with a reducer to the cat back but some have said that the cat back starts at 2.5inch and...